Fuel-pump for internal-combustion engines.



H. R. SETZ.

FUEL PUMP FOE INTERNAL COMBUSTION ENGINES.

APPLICATION FILED DEC. 9, 1912 To all whom it may concern:

Be it known that l, Hens-R, be, a citizen of the Republic ofSwitzerland, and a resident of the city of St. Louis and @tate of.ltlisso-uria,- in: the United @tates of iti-merica, hate inventedcertain new andaudit. has for its object the production oi a:

novelfpuuip otthis kind b which the oil may be delivered: tothe cornustiou. el h In an economical iuanner due' to Variation in the capacityof the meeting chamber of: the pump according to the changes in. loadimposed; onthe engine and the speed.

of theiengine.-.

The accompanying drang; in -in part a;-

longitudinali sectionand inrpemt: an elevatiorr on y plltttu.

cylinderaud 2 a plungen operable in said cylinder. The plunger Qtisdissed to be drirenchy; acnault shaft 3 that enters into thestructureotc an internal combustion engine, between which: is a connectrod 4:.

Within the pump cylinder 1 iota easuring'ohambor' 5 into which the plr 2is adaptedto operate. 'llhis measuring chant beris designedto receive asupply at liquid tuelg. for; instance, oil, and tie fuel received by thechamber is intended to be forced therefrom to the cylinder. otaninternal combustion engine The measuring chamher 5 oh the pp cylinderreceives liquid tuel from: an inlet chamber 6 adjoining, the pumpcharnberg between which and saidpump chamber is adelivery duct Zcontrolled. by. a suction valve 8, the liquid fuel being conducted intothe inlet chamber 6 from any suitable source ol supply, and drawn to themeasuring chamber 5 during rearward strokes of the plunger 9t, and theautomatic opening of the suction valve 8. The liquid fuel. is.torcedt'rom the measuring chamber 5 through the duct 9 that iscontrolled by an induction valve 10, and. is

aneeifieauea or hetters-Patent:

.tlpultoation filed December 9 lttm.

Pa'tentedtllet. dd; littlt eerie-1 no. reason.

adapted tobe arranged inv communication with the cylinder of an internalcombustion engine oil a common type;

dadiacentto the measuring chamber 5 in the cylinder 1 of'iny pump is a:diaphragm chamber 11. that has communication with the measuringchamberthrough a port 12 that permits the liquid :tuelentering into themeasuring chamber to pass therefrom into said diaphragm chamber. 'lthediaphragm chamber 11, as herein shown, is produced by a chambered member13 secured to the cylinder 1, but may be pro duced in any other suitablemanner. In said diaphragm chamber is a diaphragm it. that is arranged inopposition to the plunger 2, and is adapted; to be deflected bypressureot liquid fuel; thereagainst in cident to force exerted'against the fuelin the measuring chamber 5 by the blunger 2, thereby enlarging the spacefor the liquid fuel that becomes confined. between: the inleta-ndeduction valves 8' and 10 of my pump. Deflection of the diaphragm 14 isregulated: by controlling; meanscomprising the following; elements; 1-5is a movable abutment; having a head 16' located baolr at the diaphragm14 in opposition to the plunger 2. 'llhi'smovable abutment is adapted tobe moved forwardly relative to the diaphragm. and the opposing plungerbit Q through the medium. oil a governor l'l,

cotiperable with the shaft 3 by Which the plunger 2 is driven, whichgovernor may be of any suitableconstruction; in the construction hereinillustrated. the governor includes a sleeve 1d slidable longitudinallyof the shaft 3', and said sleeve has connected toit alever 19 thatis'pivotally supported at 2G. Thearrn of the lever 19 farthest trom'thegovernor sleeve 15} has pivoted to it at 21 a.- linlr- 22; to which isconnected a wedge 23, which is operable against the outer end of themovable abutment 15..

In the practical. use of my pump, liquid tuel is drawn tothe measuringchamber 5 olthe pump cylinder 1 during; the return strokes ot the pumpplunger 2, and the con. sequent opening of the suction valve 81 Theliquid fuel is forced from. said measuring l When the pump is operatingunder a norman load, or less than a normal load, the movable abutment 15remains stationary, or substantially stationary, back of the dia phragm142 and separated therefrom, as indicated in the drawing. Consequently,the force against liquid fuel in the measuring chamber 5 created by theforward strokes of the pump plunger 2 to force the liquid fuel from themeasuring chamber through the eduction duct 9 acts to deflect thediaphragm 14:, and the capacity of the measuring chamber is increased,according to the degree. of deflection of said diaphragm] Jnder normaloperation of an engine supplied with liquid fuel by my pump, thediaphragm 14 is deflected to a corresponding degree upon each forwardstroke of the plunger 2 and, therefore, a uniform delivery of liquidfuel is discharged from the pump to the combustion chamber of theengine. When, however, the speed of the engine becomes greater, or theload upon the engine becomes greater, necessitating a greater supply ofliquid fuel to the combustion chamber, the quantity of liquid fueldischarged from the measuring chamber is increased by limiting orpreventing the deflection of the diaphragm lat, due to liquid fuelpressure thereagainst, so that the liquid fuel will be confined within aspace comprising the measuring chamber, that is not susceptible of theenlargement incident to the deflection of the diaphragm 14 that occurswhen the pump is operating under normal conditions. When the greatersupply of liquid fuel is required, the movable abutment 15 isautomatically advanced toward the diaphragm 1 1 by virtue of its beingactuated by 'the governor l7.- This movement is accomplished by thegovernor sleeve 18 acting upon the lever 19 fitted thereto, therebyimparting movement to the wedge 23 and causing the latter member toadjust the abut ment 15 toward the diaphragm-14. The said diaphragm isthen limited in deflection or prevented from deflection by coming intocontact with the head ofthe abutment when pressure is exertedthereagainst by liquid fuel acted upon by the pump plunger 2, and thedesired increased discharge of liquid fuel from the measuring chamber ofthe pump is derived.

The diaphragm 14 is herein shown and described as being located in achamber separate from the measuring chamber 5, but it is obvious thatsuch diaphragm might be located directly in such measuring chamberwithout departing from my invention.

It is to be understood in this connection that the entire space betweenthe pump plunger 2 and the diaphragm 14: is included in themeasuringchamber of the pump, irrespective of the use herein of separate terms toindicate the measuring chamber and the diaphragm chamber. I will alsoadd that other governor operated means than the wedge 23 might beutilized for imparting movement to the movable abutment 1 5, and thatsaid removable abutment may be of other forms than that shown; and Itherefore do not limit myself to the details of construction shown anddescribed relative to these parts.

I claim l. A fuel feed pump for internal combustion engines, comprisinga cylinder having a measuring chamber, means operable to force liquidfuel from said measuring chamber, a diaphragm determining the capacityof said measuring chamber deflectable by pressure exerted against liquidfuel in said measuring chamber, an engine governor, and means operableby said engine governor whereby deflection of said diaphragm isprevented or controlled.

2. A. fuel feed pump for internal combusion engines comprismg a cylinderhaving a measuring chamber therein adapted to receive liquid fuel, aplunger operable to force liquid fuel from said measuring chamber, adiaphragm defiectable by pressure exerted by said plunger against liquidfuel in said measuring chamber, an engine governor, and an adjustableabutment operable by said engine governor whereby the degree of deflection of said diaphragm is controlled.

3. A fuel feed pump for internal combustion engines,- comprising acylinder having a measuring chamber formed with an open ing, a yieldablediaphragm closing said opening, means operable to force liquid fuelthrough said measuring chamber, an engine governor, and means operableby said engine governor for limiting the movement of said diaphragm.

4. A fuel feed pump for internal combustion engines, comprising acylinder having a measuring chamber, means operable to force liquid fuelfrom said measuring chamber, a yieldable member determining the capacityof said measuring chamber deflectable by pressure exerted against liquidfuel in said measuring chamber, an engine governor, and means operableby said engine governor whereby deflection of said yieldable member isprevented or controlled.

E. B. LINN, A. J. MGCAULEY.

